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    精英家教网 > 高中英语 > 题目详情
    20．A small car is big enough for a family of three          you need more space for baggage．（　　）
    A．onceB．in caseC．ifD．unless

    分析 一部小车对于三口之家已经足够大了，除非你需要更多的空间来放行李．

    解答 答案D．once"一旦"，引导时间状语从句；in case"万一"，引导条件状语从句；if"如果"，引导条件状语从句；unless"除非，如果不"，在意义上相当于if…not，因此在有些场合中unless与if…not可互换使用，引导条件状语从句．分析可知前后两句话之间是逻辑上的"条件"关系，可排除A．再根据句子所表达的意思"除非你需要更多的空间来放行李"可知B和C项句意不通顺，故答案选D．

    点评 本题考查从属连词的用法．连词的用法辨析，要注意分析主从句之间的关系，再确定相应的连词，同时注意不同的连词的语义及用法区别．本题尤其要注意区分unless和if的用法．unless在意义上相当于if…not，因此在有些场合中unless与if…not可互换使用．如：Unless I am mistaken，I've seen that man before．=If I am not mistaken，I've seen that man before．如果我没搞错，我以前见过那个人．

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